<!DOCTYPE html>
<html lang="ZH-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<style>
    div{
        width: 200px;
        height: 200px;
        background: red;
        transition: all 2s linear 2s;
    }
    /*
    all 所有属性
    2s  动画时间
    liinear 匀速
    2s 延时
    */
    div:hover{
        height: 600px;
        background: yellow;
    }
</style>
</head>
<body>
    <div>

    </div>
</body>
</html>